Remediation 6.1 CFA Statistical Vocabulary

Vocabulary:

Observational Study: which collects data about some characteristic(s) of the population by observation, by a survey or interview, or by other means.

Experimental Study: participants are separated into one or more groups and receive some sort of treatment.

What is a Survey?

A Survey is a questionnaire in which each participant fills out their own responses.

A survey is often used to find out general information or to attempt to determine public opinion on a topic.

Example: Customer Satisfaction Surveys.

Multiple Choice

In the context of surveying, how would you differentiate between a sample and a population?

• A sample refers to a specific demographic, while a population refers to a general demographic.

• A sample refers to the entire group being surveyed, while a population is a smaller group within it.

• A sample is a subset of the population being surveyed, while a population refers to the entire group.

• In surveying, a sample and a population are essentially the same thing.

Multiple Choice

Survey, experiment, or observational study:

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When left unsupervised, will children eat a bowl of candy?

• Survey

• Observational study

• Experimental study

Multiple Choice

A study of 1,000 people aged 20–30 asked how much television each person watches each night and how each person would rate their energy level in the evenings.

Is this study a survey, observational study, or experimental study?

• Survey

• Observational study

• Experimental Study

Multiple Choice

One group of subjects was given an herbal supplement and another group was given a placebo. After one year, the number of illnesses each group had was compared.

• Observational Study

• Experiment

Vocabulary:

Treatment Group: a group to receive the treatment.

Control Group: a group that does not receive any treatment.

Treatment: what is given to the treatment group.

Multiple Choice

To test the effects of eating breakfast on test grades. I randomly select half of my students and feed them breakfast while giving the other half nothing to eat. I then give them all a test and compare the test grades of each group. What is the control group for this experiment?

• The students who did not get any breakfast from me.

• The students who pass the test.

• The tests.

• There was no control

Multiple Choice

To test the effects of eating breakfast on test grades. I randomly select half of my students and feed them breakfast while giving the other half nothing to eat. I then give them all a test and compare the test grades of each group. What is the treatment group for this experiment?

• The students who did get breakfast from me.

• The students who pass the test.

• The tests.

• There was no control

Recognizing Bias

• Unbiased Sample: Represents entire population; Valid

• Biased Sample: Over- or Under-represents part of the population; Invalid

Multiple Choice

A computer science teacher wants to know how often students at a school access the Internet. The teacher uses a sample of students from one of her computer classes.

• Biased

• Unbiased

Multiple Choice

Your school principal randomly selects 5 students from each grade to complete a survey about school spirit.

• Biased

• Unbiased